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Cup vs dockcheck: catalog facts
Cup	dockcheck
Free Free and open source.	Free Free and published on GitHub.
Web, Self-hosted, Command line	Linux, Command line
Fast checks across many images Web dashboard as well as a command-line mode	Checks for updates without pre-pulling images Interactive or fully unattended operation
Reports updates but does not apply them Maintained by a single developer	Command-line only, no graphical interface Works with Docker containers only
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.